Optical Strain Measurement

Traditional strain measurement techniques collect data only from a selected number of locations. Decisions on where to locate strain gages are typically based on analytical models or “educated guesses.” Often, the manner in which a gage is mounted, and the interpretation of the resulting data, is a topic of debate.

The bonding of strain gages and lead wires in traditional testing makes the process of traditional strain measurement both costly and time-consuming. Bonded strain gages and lead wires are subject to large “g” forces on rotating hardware, and often to elevated temperature conditions. Unfortunately, gages may occasionally detach during testing, compromising the data obtained. It is very difficult to strain gage “tight” locations reliably. Furthermore, bonding a gage to a small feature could alter its deflection upon loading.

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